Fix clang warnings, add clang to travis

Jan Breuer

2015-10-04 df3eeb1a9be519b5eaef18b8f7c2d7a201bf7b97

 .gitignore

@@ -1,3 +1,9 @@
# VIM/KDevelop Files
*.swp
*.kdev4
.kdev4/
*.kate-swp

# Object files
*.o